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HBASE-14110 Add CostFunction for balancing primary region replicas

This commit is contained in:
tedyu 2015-07-17 09:56:37 -07:00
parent 834f87b23d
commit b98598f363
1 changed files with 41 additions and 0 deletions
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41
hbase-server/src/main/java/org/apache/hadoop/hbase/master/balancer/StochasticLoadBalancer.java
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@ -167,6 +167,7 @@ public class StochasticLoadBalancer extends BaseLoadBalancer {
costFunctions = new CostFunction[]{
new RegionCountSkewCostFunction(conf),
new PrimaryRegionCountSkewCostFunction(conf),
new MoveCostFunction(conf),
localityCost,
new TableSkewCostFunction(conf),
@ -946,6 +947,46 @@ public class StochasticLoadBalancer extends BaseLoadBalancer {
}
}
/**
* Compute the cost of a potential cluster state from skew in number of
* primary regions on a cluster.
*/
static class PrimaryRegionCountSkewCostFunction extends CostFunction {
private static final String PRIMARY_REGION_COUNT_SKEW_COST_KEY =
"hbase.master.balancer.stochastic.primaryRegionCountCost";
private static final float DEFAULT_PRIMARY_REGION_COUNT_SKEW_COST = 500;
private double[] stats = null;
PrimaryRegionCountSkewCostFunction(Configuration conf) {
super(conf);
// Load multiplier should be the greatest as primary regions serve majority of reads/writes.
this.setMultiplier(conf.getFloat(PRIMARY_REGION_COUNT_SKEW_COST_KEY,
DEFAULT_PRIMARY_REGION_COUNT_SKEW_COST));
}
@Override
double cost() {
if (!cluster.hasRegionReplicas) {
return 0;
}
if (stats == null || stats.length != cluster.numServers) {
stats = new double[cluster.numServers];
}
for (int i =0; i < cluster.numServers; i++) {
stats[i] = 0;
for (int regionIdx : cluster.regionsPerServer[i]) {
if (regionIdx == cluster.regionIndexToPrimaryIndex[regionIdx]) {
stats[i] ++;
}
}
}
return costFromArray(stats);
}
}
/**
* Compute the cost of a potential cluster configuration based upon how evenly
* distributed tables are.